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"So a 250 watt bulb uses half the energy in..."

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Watts is power. Power is how fast one delivers energy. So a 250 watt bulb uses half the energy in any equal time to a 500 watt bub, 1/4 the energy in the same time to a 1.000 watt= 1 kilowatt bulb. A typical residential cost for electricity is $0.10 per kilowatt hour, so the 250 watt = .25 kilowatt bulb in one hour uses 0.25 kWh (kilowatt hours) = 0.25 kW X $0.10 /kWhr= $0.025. Twice as much current and energy and cost for a 500 Watt bulb, etc.

"You pay for power by the kilowatt hour which means you pay a set..."

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You pay for power by the kilowatt hour which means you pay a set fee to use 1000 watts per hour. 24 hours times 100 watts = 2.4 kw/hours
Example: We pay 10 cents per kilowatt hour times which is 24 cents to run the bulb for 24 hours.

"These 3 factors contribute to the price of running a lightbulb..."

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Depends the power output and the duration for which it is on. Also do not know how much you are charged for power. These 3 factors contribute to the price of running a lightbulb. roger deinhardt 387210.

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